you think of the energy, off, thatshell goes is the kind of pressure we are talking about.e start with the sphere. we pressure ties the sphere and the chamber. we realize that works. now we tell the science community we are doing this. ththey have to believe us because we have got a sphere. now we have to wrap the rest of the sub around that sphere. >> at every moment on this journey we have just described, in your mind it was james cameron that was going to be in the vessel? >> unquestionably. it would not be any fun. i knew i was going to be a least one of the pilots. >> was their decision that you made a decision that had to be sold because of the demand of the trip? >> it was really based on the size that the sphere could be. the vehicle gets bigger and order to floated and bring it back to the surface. you reach a certain pressure where you cannot lift it ship anymore. then you're in a class of vehicles that you have to tow out there. >> -- went down in 1960. >> two guys. john walsh and jacque picard. don walsh became a friend of mine. he's in the arctic at the age of